题目内容

The task of _________ can not be executed by the holder of GMDSS General Operator's Certificates.

A. any adjustments or maintenance， which may affect the proper operation of the MF/HF radio station.
B. replacement of consumable items such as paper， ribbons， etc.
C. resetting tripped circuit breakers or replacing defective fuses.
D. routine battery maintenance， if used as part of the GMDSS station.

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Regarding the NAVTEX system, _________is not true.

A. NAVTEX is a single frequency broadcast system (using NBDP narrow band direct printing) Telex on 518 kHz.
B. A selective message -rejection feature of the receiver allows the mariner to receive only that safety information pertinent to his requirements.
C. NAVTEX must be broadcast in the prevailing language of the coast station only.
D. NAVTEX carries information relevant to all sizes and types of vessels within a region established for this service.

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The letter E in EPIRB is the abbreviation for the word _________.

A. English
B. Engineering
C. Edit
D. Emergency

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The followings are used in the GMDSS except _________.

A. the Inmarsat system
B. VHF， MF and HF DSC systems
C. the Cospas-Sarsat system
D. AIS systems

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Which one of the following keystrokes or characters is sent as part of ARQ communications to switch information transmission control from one station to the other?

A. The plus and question mark keys ('+?')
B. The 'ENTER' key
C. The go-ahead (GA) command
D. The 'END1 key

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